Hosein Arzani; Jalal Abdollahi; Mehdi farahpour; Mojganolsadat Azimi; ali Ashraf Jafari; Mahmoud Moalemi
Volume 12, Issue 3 , August 2019, , Pages 263-286
Hosein Arzani; Hamidreza Mirdavodi; Mehdi Farahpour; Mojganolsadat Azimi; Seyed Hasan Kaboli; Abasali Sanadgol; Morteza Akbarzadeh; Valiollah Mozafarian
Volume 12, Issue 4 , August 2019, , Pages 409-436
Morteza Khodagholi; Farhang Ghasriani; Mina Bayat; Mojgan sadat Azimi
Volume 19, Issue 3 , December 2012, , Pages 512-521
Abstract
Appropriate utilization of plant species in rangelands is one of the principles of sustainable production in rangeland ecosystems that leads to continuous and economic utilization of rangelands. In order to achieve stability and continuity of production in steppe rangeland, this study was performed to ...
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Appropriate utilization of plant species in rangelands is one of the principles of sustainable production in rangeland ecosystems that leads to continuous and economic utilization of rangelands. In order to achieve stability and continuity of production in steppe rangeland, this study was performed to investigate the effect of different harvesting intensities on forage production and vitality of Stipa arabica at Isfahan Soh site, during 2007 to 2010. Treatments in each block were included four grazing intensities of 25, 50 and 75% and control (no harvest). In each treatment, 10 individuals of species were used as replications evaluated on each of the dependent variables. A factorial experiment in a completely randomized design with ten replications and four years was used to analyze the data. Data analysis was performed by SAS software. Results showed that forage production of Stipa arabica did not differ statistically in response to different harvesting intensities, and up to 75 percent of this species could be harvested, but heavy harvesting intensity decreased the vigor and vitality of the species during the examined years. Harvesting intensities were significant at 1% level of probability and production rate decreased gradually over the 4 years. According to the results, a harvesting intensity of 50% is recommended for Stipa arabica in this region so that health and vitality of this species is preserved during the harvesting years.
Jallal Abdolahi; Hossean Arzani; Mohammad hosein Savaghebi; Mojgan Azimi; Hosein Naderi
Volume 19, Issue 1 , June 2012, , Pages 45-59
Abstract
Our country’s rangelands are mainly located in arid and semi-arid regions. Due to the low amount of precipitation and high rate of evapotranspiration, water stress is considered as the most crucial environmental stress for vegetation in this region. This study was conducted at Khud-e-sofla ...
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Our country’s rangelands are mainly located in arid and semi-arid regions. Due to the low amount of precipitation and high rate of evapotranspiration, water stress is considered as the most crucial environmental stress for vegetation in this region. This study was conducted at Khud-e-sofla rangelands for nine years (1378- 1386) to investigate the effect of precipitation fluctuation on canopy cover and production of important plant species. For this purpose, four dominant species were selected and their canopy cover and production were monitored every year in permanent and random plots, respectively. Precipitation data were collected from the nearest synoptic station. According to the data of precipitation, cumulative rain amount was calculated at various periods. The relationship between variables of plant parameters and cumulative rain amount was analyzed by step wise regression method in SPSS 13. The results showed that plant species often reacted to the precipitation fluctuations. However, various species reacted differently to the precipitation fluctuation in terms of cover and production. The total vegetation cover as well as canopy cover of Artemisia aucheri hada negative and significant correlation with winter precipitation.Whereas, precipitation of January to April and the past year precipitation exhibited a high correlation with canopy cover of Iris songarica and Stipa barbata. The forage production was also influenced by seasonal precipitation. According to the results, total yeild and the yield of Artemisia aucheri, Lactuca orientalis, Stipa barbata could be estimated by precipitation data While, estimation of forage production through the precipitation data was not enough accurate for Iris songarica.
Masoud Borhani; Hossein Arzani; Zahra Jaberolansar; Mojgan Azimi; Mahdi Farahpor
Volume 17, Issue 1 , September 2010, , Pages 1-20
Abstract
Range condition is known as an important indicator for assessment in range management. Many techniques have been exploited for determining this indicator, from which four-factor method has been used in this study. Some communities at stepic regions of Isfahan province were selected. In each selected ...
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Range condition is known as an important indicator for assessment in range management. Many techniques have been exploited for determining this indicator, from which four-factor method has been used in this study. Some communities at stepic regions of Isfahan province were selected. In each selected community, an area was chosen as key area, and a total of eight sites were selected in the key areas. Soil erosion, canopy cover, plant composition, and plant vigor were monitored for each site. The results revealed a significant difference between the sites in terms of the above mentioned parameters, as well as their rainfall (p<0.01). Moreover, there was a significant correlation between annual precipitation and range condition score. The correlation showed different patterns within years in each site, where the difference between years was significant in terms of plant vigor and canopy cover, but non-significant in terms of soil erosion and plant composition. There was also a positive correlation between the trend of individual parameters and the overall condition score. Cluster analysis grouped Aluyjeh, Northern Shahreza, and Charmshahr sites in one branch, Mooteh, Shoorabad, and Golpayegan in another, and finally Komeshcheh and Southern Shahreza in a third branch. The lowest rank for canopy cover, canopy production and soil erosion belonged to Komeshcheh and Southern Shahreza sites. Aluyjeh, Northern Shahreza, and Charmshahr sites were in better condition than the previous group, yet in poor conditions, and the rest of the sites showed the best conditions among study sites. Generally speaking, Isfahan's stepic rangelands are ranked as poor to very poor, while their condition showed a constant trend.
Ali Ehsani; Hosein Arzani; Mahdi Farahpoor; Hasan Ahmadi; Mohammad Jafari; Adel Jalili; Hamid Reza Mirdavodi; Hamid reza Abbasi; Mojgan Azimi
Volume 14, Issue 2 , January 2007, , Pages 249-260
Abstract
The effects of climatic factors on four dominant range land species of Markazi province, Iran, were studied. Species were Artemisia sieberi, Salsola rigida, Noaea mucronata, Stipa barbata and were monitored from 1998 to 2005. Site is located in steppe lands and called Nemati range, Akhtarabad of Saveh. ...
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The effects of climatic factors on four dominant range land species of Markazi province, Iran, were studied. Species were Artemisia sieberi, Salsola rigida, Noaea mucronata, Stipa barbata and were monitored from 1998 to 2005. Site is located in steppe lands and called Nemati range, Akhtarabad of Saveh. Climatic factors were annual rainfall, rainfall of grazing season plus rainfall of previous year, temperature, solar radiation and wind velocity. Among the main indicators, as results shows, growing season plus previous rainfalls is the most effective indicator on forage production with high and significant correlation. Total yield have positive and significant correlation with growing season rainfall and previous rainfall as well as production of Artemisia sieberi, Salsola rigida. Soil and water regime in dry and semi-dry areas, in growing season, is in a way that plants are dependent on stored moisture. Shrubs, with their deep roots, are more capable of using this moisture. Therefore stored moisture could be known as an indicator of rain quantity. Result of this research showed that rainfall indicator in growing season and previous season is a variable that plays fundamental rule in production, showing a linear relationship. Negative correlation was shown between number of sunny days, total yield and yield of two species, Salsola rigida and Artemisia sieberi.